Uni or multi polar oil break switch



Oct. 22, 1929. H. KERGEL 1,732,895

UNI-on MULTI-POLAR OIL BREAK swITcH Filed Aug. '7, 1924 Patented Oct.22, 1929 UNITED STATES PATENT OFFICE- HERMANN KEBGEL, 0F DBESDE,GERMANY,ASSIGNOR T0 THE FIRM OF SACHSEN- WERK, LICHT-UNDKRAFT-AKTIENGESELLSCHAT, OF NIEDERSEDLITZ, NEAR DRESDEN, GERMANY 'UNI ORMULTI POLAR OIL BREAK SWITCH .Application :filed August 7, 1924, SerialNo This invention relates to oil break electric switches and has for itsobject to provide an improved switch of this type in the f orm either ofa unipolar or multlpolar switch.

ln oil break switches as heretofore constructed the pulleys, guiderollers and the like, carrying and guiding the rope of the apparatus:tor lowering the oil tanks are arranged outside the cover of theswitch, or on the traveling frame of the switch, whereby the ropes whichalso are situated outside are often exposed to damage and generally arein the way of relays, circuit breakers and the like, which are arrangedon the switch.

Furthermore, short circuits may be caused by the rupture of the ropes,especially when said ropes are situated above the cover.

Tn the case of electric motor controllers it has heretofore beenproposed to provide pulleys under the controller cover but outside thecasing to enable the casing, which may be filled with oil, to be loweredbv means of ropes when it is desired to expose the contacts.

The improved oil break switch according to the present invention is soconstructed that the principal contours of the cover and oil tank of theswitch have simple geometrical shapes completely symmetrical about thetwo main axes at right angles and the said contours differ from oneanother in such a manner that free spaces are left beneath the switchcover outside of the tank for the disposition of the pulleys or the likeof the apparatus for lowering the tank.

The space necessary for inserting the winch of the oil tank, thepulleys, ropes and the like can preferably be obtained, for instance, by

providing a circular, rounded, or polygonal,v

oil tank and a square, polygonal, or rounded lid or cover to the switch.

The accompanying drawings illustrate an example of the improvedconstruction of the oil break switch according to the present inventionin which Figure l is a side elevation and partial secion, the sectionbeing taken on the line A-B,

gig. 2 is a plan and partial cross section, an

. 730,578, and in Germany October M, i923.

per end oi the oil tank lies within the cover there are provided spacesg between the con uer'portions of the oil tank and the adjacent innerportions of the cover. These spaces o' are utilized for the pulleys andropes employed for raising and lowering the oil tank..

ln one corner of thc cover there is a pulleyr a mounted on a shafta,which may be suitably journaled in the cover. This shaft h may beoperated extcriorly of the cover bv means of a suitable crank k orotherwise. Onv the inu ner end of the pulley a the rope e is suitablycoiled and extends downwardly therefrom and at its extremity is suitablyconnected to a lug z extending 'from the oil tank for this purpose. Onthe outerend of this pulley a a rope e8 is suitably coiled. This rope eseX- tends from the outer end of the pulley a through a tube or conduit csuitably connected to the cover for this purpose. This rope es thenpasses over a pulley I; mounted on a stub shaft 7n suitably journaled inthe cover cl and a bracket m, or otherwise` and the extremity of therope es is suitably connected to a lug 112 extending from the oil tankfor this purpose.

At the opposite end of the shaft h there is a pulley a. A rope e iscoiled on the inner end of this pulley and passes from the same and hasits extremity suitably connected in a lug` z" provided on the oil tankfor this purpose. On the outer end of the pulley a there is a rope e.This rope e2 passes from the outer end of the pulley a through a tube orc onduit c similar to the tube c and then passes over a pulley b on astub shaft h2 suitably mounted in the cover d and a bracket m', orotherwise, and the extremity of the rope e is suitably connected in alug` i provided on the oil tank for this purpose.

By reference to Fig. 3 it will be seen that instead of making the oiltank polygonal 1n plan the same may be circular in plan and theconstruction of the other parts of the apparatus may be made the same inall respects as those diereinbefore described in connection with thiormof the invention shown in Figs. ll and 2. Obviously also the tubes orconduits c and c through which certain of the ropes pass may be arrangedon the interior of the cover by being cast integral therewith, or in anyother manner.

I claim as my invention:

1. In an oil break switch, a tank, a cover therefor, the said tank andcover being of different configurations to provide pockets inpredetermined positions exteriorly of the tank and interiorly of thecover when the tank is in position relatively to the cover, devicesmounted within the said pockets and concealed ltherein for raising andlowering the tank relatively to the cover, and means also within thecover for protecting the said devices by preventing the upper portion of-the tank from coming into contact therewith when in place within thecover, and for preventing said devices if'broken from falling into thetank and causing short circuits therein.

2. In an oil break switch, a tank of predetermined configuration, arectangular cover adapted to receive the upper portion of the tank andto thereby provide pockets between the exterior ofthe tank and thecorners of the cover, devices mounted within the said pockets andconcealed therein for raising and lowering the tank relatively to thecover, and means also within the cover for protecting the said devicesby preventing the upper portion of the tank from coming into contacttherewith when in place within the cover, and for revcnting said devicesif broken from falling into the tank and causing short circuits therein.

3. In an oil break switch, a-rectangular cover, a tank the upper portionof which is adapted to be received in the cover and is of sucha'configuration as to provide pockets between the exterior of the tankand the corners of the cover, pulleys mounted in the said pockets, ropespassing over the said pulleys and connected at oppositely disposed partsof the tank, the said pulleys and ropes being enclosed within andconcealed by-the cover, whereby through the pulleys and ropes the tankmay be raised and lowered relatively to the cover, and means also withinthe cover through which a rope passes for preventing the upper portionof the cover from contacting with the rope when the tank is raised sothat its upper portion is in position within the cover, and forpreventing said ropes if broken from falling into the tank and causingshort circuits therein. K

4. In an oil break switch, a rectangular cover, a tank the upper portionof which is adapted to be received in the cover and is of such aconfiguration as to provide pockets between the exterior of the tank andthe corners of the cover, pulleys mounted in the said pockets, ropespassing over the said pulleys c and connected at oppositely disposedparts of the tank, the said pulleys and ropes being enclosed within andconcealed by the cover, whereby through the pulleys and ropes the tankmay be raised and lowered relatively to the cover, and a guide tube alsowithin the

